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From: Korisk <Korisk@yandex.ru>
To: Craig Ringer <ringerc@ringerc.id.au>
Cc: Sergey Konoplev <gray.ru@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: hash aggregation
Date: Thu, 11 Oct 2012 19:15:13 +0400
Message-ID: <53981349968513@web6f.yandex.ru> (raw)
In-Reply-To: <50764D55.2060401@ringerc.id.au>
References: <118871349885342@web16f.yandex.ru>
	<CAL_0b1tHHHGz=umGWm=FXkSkt+yCJh-Cb10BJLoD-i3mwvNeaQ@mail.gmail.com>
	<323831349928808@web5g.yandex.ru>
	<50764D55.2060401@ringerc.id.au>

"IOS scan" ?
Index Only Scan

What's your seq_page_cost and random_page_cost?

hashes=# SELECT name, setting, reset_val FROM pg_settings WHERE setting <> reset_val;
          name           |    setting     | reset_val 
-------------------------+----------------+-----------
 archive_command         | (disabled)     | 
 enable_bitmapscan       | off            | on
 enable_indexscan        | off            | on
 enable_seqscan          | off            | on
 log_file_mode           | 0600           | 384
 random_page_cost        | 0.1            | 4
 seq_page_cost           | 0.1            | 1
 transaction_isolation   | read committed | default
 unix_socket_permissions | 0777           | 511
(9 rows)

Postgresql 9.2.1 was configured and built with default settings.

Thank you.

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